Answer:
9
Step-by-step explanation:
Divide both sides by 8 to get a=72/8.
72/8 is (80-8)/8 or 10-1 or 9.
Let's think about it like this. Which number, when we divide 72 by 8 comes out.
Well, 9*8=72, so a is the only option
a=9
Hope this helps
